PLATE 2 



EXPLANATION OF FIGURES 



Figures 8 and 11 are from human embryos, the others from pig embryos. The 

 reduced magnification is now 630 diameters. 



8 An osteoclast showing a finely striate border in apposition with the bone. 



9 A striate border of coarse, block-like composition. 



10 An osteoclast wrapped around an eroded spicule and conforming closely to 

 its irregularities. The bone cell, b.c, is nearly incorporated. 



11 Abrupt transitions. *, between an osteoclast and adjacent osteoblasts. 

 The bone cell, b.c, is confluent with the phagocytosing osteoclast. 



11' On the right, the bone cell, b.c, has practically lost its identity and become 

 a part of the osteoclast. At the left, several encapsulated bone cells, b.c.', lie 

 within the osteoclastic cytoplasm. 



13 Two stellate, encapsulated bone cells, have been taken up during bone 

 resorption. 



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